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# When calculating the velocity of a galaxy, using Doppler...

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 Question by Joanne Hall Submitted on 4/14/2004 Related FAQ: [sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) Rating: Rate this question: N/A Worst Weak OK Good Great When calculating the velocity of a galaxy, using Doppler shift, do you use the formula v/c=delta lambda/lambda?  Or do you work out the redshift using the formula z=delta lambda/lambda and then once you know the value of z, use that in the equation v=zc to calculate the velocity?  I'm a bit confused as to when these equations can be used.  Also, in each case, what does lambda stand for?

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